WO2001024156A1 - Procede de commande d'un ecran a cristaux liquides couleur et procede de commande de l'affichage de la montre - Google Patents

Procede de commande d'un ecran a cristaux liquides couleur et procede de commande de l'affichage de la montre Download PDF

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Publication number
WO2001024156A1
WO2001024156A1 PCT/JP2000/006675 JP0006675W WO0124156A1 WO 2001024156 A1 WO2001024156 A1 WO 2001024156A1 JP 0006675 W JP0006675 W JP 0006675W WO 0124156 A1 WO0124156 A1 WO 0124156A1
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WO
WIPO (PCT)
Prior art keywords
signal
color
liquid crystal
electrode
display
Prior art date
Application number
PCT/JP2000/006675
Other languages
English (en)
Japanese (ja)
Inventor
Kanetaka Sekiguchi
Original Assignee
Citizen Watch Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Citizen Watch Co., Ltd. filed Critical Citizen Watch Co., Ltd.
Priority to US09/831,904 priority Critical patent/US6429840B1/en
Priority to EP00962898A priority patent/EP1148468A4/fr
Publication of WO2001024156A1 publication Critical patent/WO2001024156A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0023—Visual time or date indication means by light valves in general
    • G04G9/0029—Details
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0082—Visual time or date indication means by building-up characters using a combination of indicating elements and by selecting desired characters out of a number of characters or by selecting indicating elements the positions of which represents the time, i.e. combinations of G04G9/02 and G04G9/08
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
    • G09G3/18—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2011—Display of intermediate tones by amplitude modulation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
    • G09G3/3644—Control of matrices with row and column drivers using a passive matrix with the matrix divided into sections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0205—Simultaneous scanning of several lines in flat panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant

Definitions

  • the present invention relates to a liquid crystal display panel that includes a color filter and performs color display. In order to reduce the power consumption of the liquid crystal display panel, the display colors are reduced, limited, and drive signals are stopped to reduce power consumption.
  • the present invention relates to a method of driving a liquid crystal display panel that enables the above. Also, the present invention relates to a display control method for a timepiece which drives a liquid crystal display panel by such a driving method and which strongly demands low power consumption. Background technology
  • a color display is performed by applying a selection signal to all the signal electrodes constituting the pixel portion of the liquid crystal display panel in a time-division manner and applying a data signal to a counter electrode corresponding to the selection signal of each signal electrode.
  • the display pattern signal is used.
  • color display pattern signals There are two types of color display pattern signals: one that uses a display pattern signal that applies multiple stages of grayscale signals, one that uses a display pattern signal that applies several stages of grayscale signals, and uses only ON / OFF. Color display can also be performed using a binary color display pattern signal. Even when a non-stepwise gradation signal is applied, it can be treated as a multistep gradation. That is, it can be handled as a smooth gradation having a large number of gradations.
  • a full-color display is one in which a stepless gradation signal is applied as described above.
  • a device to which a multi-level gradation signal is applied is also referred to as a full color display.
  • a liquid crystal display panel having a display pattern signal that applies a multi-stage gradation signal, applies a plurality of stages of gradation signals, or uses only on / off is used. Development is taking place.
  • the liquid crystal display panel has good display quality. Also, as in the case of televisions shifting from monochrome display to color display, the display of information can be diversified by using color display.
  • SID 92 Digest “Active Ad dressing Me thod for High igh” is used.
  • Contrast Video RVate STN Disp 1 ay ”, but a voltage according to an orthogonal function is simultaneously applied to the row electrodes (signal electrodes) and the column electrodes (data electrodes) are applied to the column electrodes (data electrodes).
  • a mobile phone or the like employs a partial display in which display is limited to icons and the like in a reception standby state, but there is a problem that the amount of information that can be displayed is reduced.
  • the present invention provides a liquid crystal display device having a color filter and capable of providing a large amount of information to a user of the liquid crystal display device by color display, and consuming the liquid crystal display device while maintaining display quality as much as possible.
  • the purpose is to reduce power consumption and prolong battery life.
  • the present invention provides a method for manufacturing a semiconductor device, comprising: a transparent first substrate on which a plurality of signal electrodes are formed; and a transparent second substrate on which a plurality of data electrodes are formed. And the surface on which the data electrodes are formed are opposed to each other, and a liquid crystal layer is sealed in the gap.
  • a color liquid crystal display panel comprising a color filter in which filters of three primary colors are alternately arranged at least on the first substrate or the second substrate at positions corresponding to the respective pixel portions.
  • a selection signal is applied in a time-division manner to a plurality of signal electrodes constituting all the pixel portions of the color liquid crystal display panel, and a data signal is applied to the data electrode corresponding to the selection signal of each signal electrode.
  • the color fill of each pixel And a selection signal is applied so as to simultaneously select a plurality of the signal electrodes, and a plurality of color filters arranged at positions corresponding to the plurality of signal electrodes And color-reduced color display for simultaneously selecting.
  • a selection signal is applied in a time-division manner to a plurality of signal electrodes constituting all the pixel portions of the color liquid crystal display panel, and a data signal is applied to the data electrode in accordance with the selection signal of each signal electrode.
  • Normal color display that enables individual selection of the color filter of each pixel unit by applying voltage, and selection signal applied to a part of the multiple signal electrodes in a time-sharing manner and selection to other signal electrodes
  • a limited color display in which only a color filter arranged at a position corresponding to a signal electrode to which a selection signal is applied without selecting a signal is selectively performed.
  • striped filters of the three primary colors are alternately arranged on the first substrate or the second substrate so that the color liquid crystal display panel to be driven overlaps the signal electrodes in a planar manner.
  • a color liquid crystal display panel provided with color filters arranged in a matrix.
  • a selection signal is applied so that a plurality of the signal electrodes are selected at the same time. It is preferable to simultaneously select a plurality of stripe-shaped filters arranged in such a manner as to overlap the signal electrodes in a plane.
  • a selection signal is applied to a part of the plurality of signal electrodes in a time-division manner, and no selection signal is applied to the other signal electrodes. It is preferable that only the striped filters arranged so as to overlap the signal electrodes to which signals are applied in a planar manner can be selected.
  • a selection signal is applied in a time-division manner to a plurality of signal electrodes constituting all the pixel portions of the liquid crystal display panel, and a selection signal corresponding to each signal electrode is applied.
  • a data signal to the data electrode
  • at least one of the selection signal and the data signal also serves as a gradation signal for changing the optical characteristics of the liquid crystal layer in multiple stages, so that each of the three primary color filters individually has the gradation required for full color display.
  • a full-color display which is selectable by having the following; and a reduced color display in which the number of stages of the gradation signal is made lower than in the case of the full-color display, and each of the three primary color filters is made individually selectable by lowering the gradation. And selectively.
  • a selection signal is applied so as to select a plurality of the signal electrodes at the same time, and a subtractive color display for simultaneously selecting a plurality of color filters arranged at positions corresponding to the plurality of signal electrodes, A selection signal is applied to a part of the electrodes in a time-sharing manner, and no selection signal is applied to the other signal electrodes.Only the color filter placed at the position corresponding to the signal electrode to which the selection signal is applied is applied. Limiting force to be selectable — display should also be selectable.
  • the transparent first substrate on which a plurality of signal electrodes are formed and the transparent second substrate on which a plurality of data electrodes are formed form a surface on which the signal electrodes are formed and a data electrode.
  • the liquid crystal layer is sealed in the gap, and the portions where the signal electrode and the data electrode intersect and overlap in a plane form a pixel portion, respectively.
  • the liquid crystal display panel by selectively applying a voltage between the signal electrode and the counter electrode, the optical characteristics of a liquid crystal layer between the signal electrode and the counter electrode in the pixel portion are changed and displayed.
  • a selection signal is applied in a time-division manner to a plurality of signal electrodes constituting all the pixel portions of the color liquid crystal display panel, and a data signal is applied to the data electrode corresponding to the selection signal of each signal electrode.
  • the individual color of each pixel section A normal display that enables selection of a filter, a selection signal is applied so as to simultaneously select a plurality of the signal electrodes, and a data signal is applied to the plurality of data electrodes in a time-division manner, so that the plurality of data electrodes are displayed.
  • a color display that enables individually selecting a plurality of stripe-shaped filters arranged so as to overlap the data electrodes in a plane and that reduces power consumption is selectively performed.
  • a selection signal is applied in a time-division manner to a plurality of signal electrodes constituting all the pixel portions of the color liquid crystal display panel, and a data signal is applied to the data electrode in accordance with the selection signal of each signal electrode.
  • a normal color display in which each of the three stripe-shaped primary color filters can be individually selected, and a selection signal applied so as to simultaneously select a plurality of the signal electrodes, and the three stripe-shaped primary color filters are applied.
  • filters of three primary colors are simultaneously selected, and black and white display for reducing power consumption is selectively performed.
  • the normal color display or the full color display and the other display may be individually performed by dividing the display area by all the pixel units of the liquid crystal display panel into a plurality of display areas. .
  • the normal color display or the full color display and the other display are switched according to the remaining amount of the battery or the amount of power generated by a power generation means such as a solar cell. It is recommended to display one mark or one full color display, and when the amount is less than the preset amount, display the other display.
  • the present invention also relates to a liquid crystal display panel for displaying time or information related to time, the method comprising combining the method with a transparent first substrate on which a plurality of signal electrodes are formed.
  • a transparent second substrate on which a number of data electrodes are formed is disposed such that the surface on which the signal electrodes are formed and the surface on which the data electrodes are formed face each other, and a liquid crystal layer is sealed in the gap;
  • a portion where the signal electrode and the data electrode intersect and overlap in a plane constitutes a pixel portion, and a position corresponding to at least the pixel portion on the first substrate or the second substrate.
  • a color filter in which filters of three primary colors are alternately arranged is provided, and by selectively applying a voltage between the signal electrode and the counter electrode, the signal electrode and the counter electrode of the pixel portion are connected to each other.
  • the present invention is applied to display control of a clock provided with a color liquid crystal display panel for displaying the time or information related to the time by changing the optical characteristics of the liquid crystal layer during the time.
  • FIG. 1 is a schematic diagram showing a liquid crystal display device to which the first embodiment of the present invention is applied.
  • FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
  • FIG. 3 is a plan view showing a liquid crystal display panel in the liquid crystal display device shown in FIG.
  • FIG. 4 is an enlarged plan view showing the inside of a circle of the liquid crystal display panel shown in FIG.
  • FIG. 5 is a sectional view taken along line 5-5 in FIG.
  • FIG. 6 is a waveform diagram showing a driving waveform of the liquid crystal display panel according to the first embodiment of the present invention.
  • FIG. 7 is a waveform diagram showing a driving waveform of the liquid crystal display panel according to the second embodiment of the present invention.
  • FIG. 8 is a waveform diagram showing a driving waveform of the liquid crystal display panel according to the third embodiment of the present invention.
  • FIG. 9 shows a driving waveform of the liquid crystal display panel according to the fourth embodiment of the present invention. It is a waveform diagram shown.
  • FIG. 10 is a waveform diagram showing a drive waveform of a liquid crystal display panel according to a fifth embodiment of the present invention.
  • FIG. 11 is a plan view, similar to FIG. 4, of a liquid crystal display device to which the sixth embodiment of the present invention is applied.
  • FIG. 12 is a cross-sectional view taken along line 12--12 of FIG.
  • FIG. 13 is a schematic plan view of a timepiece including a liquid crystal display panel to which the seventh embodiment of the present invention is applied.
  • FIG. 14 is a cross-sectional view taken along the line 14-14 in FIG.
  • FIG. 15 is a plan view showing a liquid crystal display panel used in the timepiece shown in FIG.
  • Fig. 16 is an enlarged view of a part.
  • FIG. 17 is a schematic plan view of a timepiece provided with a liquid crystal display panel to which the eighth embodiment of the present invention is applied.
  • FIG. 18 is a plan view showing a liquid crystal display panel used in the timepiece shown in FIG.
  • FIG. 19 is a cross-sectional view taken along the line 19-19 in FIG.
  • FIG. 20 is a block diagram showing a circuit for reducing the power consumption of the timepiece shown in FIG.
  • FIG. 21 is a diagram showing an example of low power consumption control performed by dividing the dot matrix display section of the timepiece shown in FIG. 17 into upper and lower parts.
  • FIG. 1 is a schematic diagram showing a liquid crystal display device to which the first embodiment of the present invention is applied.
  • FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
  • FIG. 3 is a plan view showing a liquid crystal display panel in the liquid crystal display device shown in FIG.
  • FIG. 4 is an enlarged plan view showing the inside of a circle of the liquid crystal display panel shown in FIG.
  • FIG. 5 is a sectional view taken along line 5-5 in FIG.
  • the liquid crystal display device shown in Fig. 1 is a device that displays on the display area 13 by a liquid crystal display panel.
  • a scroll (+) button 46 To change this display or as an input / output device, a scroll (+) button 46, scroll ( 1) It has a button 47, a mode switching button 48, a power switch button 49, and a speaker 50.
  • These input / output devices are connected to a circuit board 68 via a switch board 62 as shown in FIG.
  • a liquid crystal display module including a liquid crystal display panel, a battery 64, and an input / output device is mounted on a case 51, a windshield 58, and a back cover 57 to form a liquid crystal display device.
  • the liquid crystal display is provided with a pressure-sensitive sensor under the windshield 58 for recognizing that the input pen 45 has touched the display area 13. You can select the information displayed by 5 or enter characters.
  • FIG. 1 shows a state in which the character 52 of “M” has been input with the input pen.
  • the upper half of the display area 13 of the liquid crystal display device is a full-color display area for full-color display of 512 colors, while the low power consumption display area 53 of the lower half is low power consumption.
  • a first substrate 1 and a signal electrode 2 are provided from the opposite side (back side) of the windshield 58 as shown in FIG.
  • a red (R) color filter 33, a green (G) color filter 34, and a blue (B) color filter 3 are provided on a second substrate 4, which is opposed to the first substrate 1 with a predetermined gap. 5 is provided.
  • Each color filter has a stripe shape as shown in FIG.
  • the color filters 33, 34, and 35 have a stripe shape parallel to the signal electrode 2. For this reason, color mixing does not occur even if the same data signal is applied to multiple data electrodes as described later, so a reduced color display pattern signal, limited color display pattern signal, or reduced color display pattern signal is used. In this case, a clear display can be achieved.
  • the color filter 3 may be composed of three colors of cyan (C), magenta (M), and yellow (Y), or may be a dot-shaped color filter.
  • an interlayer insulating film 37 made of acrylic resin is provided on each of the color filters 33, 34, and 35.
  • the data electrode 5 is provided on the interlayer insulating film 37.
  • a portion where the signal electrode 2 and the data electrode 5 overlap is a pixel portion 7.
  • a region where the plurality of pixel portions 7 are arranged in a matrix is a display region 13.
  • the signal electrode 2 and the data electrode 5 are both striped as shown in FIG.
  • a liquid crystal layer 43 is provided between the first substrate 1 and the second substrate 4, and the liquid crystal layer 43 is sealed with a sealing material 9 and a sealing material 10. Further, an alignment film 41 made of polyimide resin is provided on the first substrate 1 and the second substrate 4 in order to align the liquid crystal layer 43 in a predetermined direction.
  • a twisted nematic liquid crystal is used as the liquid crystal layer 43.
  • the liquid crystal layer 43 is oriented in the direction of 7:30 on the first substrate 1 side and in the direction of 4:30 on the second substrate 4 side.
  • the twist angle of the liquid crystal layer 43 is 90 degrees.
  • the liquid crystal layer 43 used for twisted nematic liquid crystal The liquid crystal is not limited, and may be another liquid crystal such as a guest-host liquid crystal, a scattering liquid crystal, or a selective reflection liquid crystal.
  • first polarizing plate 21 made of 3D RDF (trade name) as a reflective polarizing plate.
  • second polarizing plate 22 composed of an absorbing polarizing plate in which a dye is stretched in one direction.
  • the first polarizing plate 21 and the second polarizing plate 22 are arranged so that their transmission axes are perpendicular to each other.
  • a light source 66 is arranged behind the liquid crystal display panel so that the liquid crystal display device can be used in a dark environment, and a circuit is provided behind the light source 66.
  • the substrate 68 is placed.
  • the connection between the liquid crystal display panel and the circuit board 68 is made with zebra rubber 61, and the connection between the light source 66 and the circuit board 68 is made with the light source terminal 67.
  • zebra rubber is used as the light source terminals 67, a spring may be used.
  • a battery 64 is fixed to the circuit board 68 by a battery holding spring 65, and the battery 64 serves as an energy source of the liquid crystal display device. Further, a switch board 62 provided with switch buttons such as a power switch button 49 is connected to the circuit board 68 via a switch FPC (flexible printed circuit board) 63. .
  • FPC flexible printed circuit board
  • the liquid crystal display device to which the first embodiment is applied is not limited to this.
  • FIG. 6 shows a driving waveform diagram used for the liquid crystal display device in this embodiment.
  • the horizontal axis of the paper is the time axis 71, and positive and negative AC waveforms are applied to each screen (field) in order to prevent the application of a DC component to the liquid crystal layer 43.
  • the time of the plus field is T f 1 (+)
  • the time of the minus field is T fl (-).
  • T f 1 is from 16 milliseconds (msec.) To several milliseconds (msec.).
  • T f 1 is short, the current consumed by the liquid crystal display device increases due to an increase in the frequency for driving the liquid crystal and an increase in the voltage applied to the liquid crystal.
  • the liquid crystal layer 43 made of twisted nematic (TN) liquid crystal causes an optical change according to the effective value of the voltage applied per unit time.
  • the liquid crystal layer 43 can be described as a parallel circuit of a resistance component and a capacitance component in an electric equivalent circuit, consumption by the capacitance component occurs when the driving voltage is switched, and consumption by the resistance component occurs in a certain time. appear.
  • an increase in drive frequency and an increase in drive voltage cause an increase in power consumption.
  • This color display signal is a full-color display signal capable of displaying eight gradations for each of the R, G, and B colors.
  • a signal that can individually select a color filter is a normal color display signal
  • the color display signal is also a normal display signal.
  • the normal color display signal may have a smaller number of gradations than the example shown here.
  • the drive voltage 81 applied to the liquid crystal layer 43 is composed of six level signals V1, V2, V3, V4, V5, and V6.
  • T fl (+) the selection signal is applied to the first signal electrode during the first selection period 74, the selection signal is applied to the second signal electrode during the second selection period 75, and the selection signal is applied during the third selection period 76.
  • a selection signal is applied to the third signal electrode.
  • the other T f 1 (+) periods are periods during which the selection signal is applied to the other signal electrodes.
  • the first signal electrode select it during the first selection period 74
  • the first selection signal 82 of the voltage level of V6 is applied, and the first non-selection signal 83 of the voltage level of V2 is applied during the other Tf1 (+) periods.
  • the first signal electrode is applied with the second selection signal 84 of the voltage level of V 1 during the first selection period to select this, In the period of T f 1 (one)
  • a second non-selection signal 85 having a voltage level of V5 is applied.
  • the selection period is shifted, a selection signal of the voltage level of V 6 is applied to the second selection period 75 of T f 1 (+), and the selection signal is applied during the other T f 1 (+). Apply a non-selection signal of V2 voltage level.
  • the second selection signal of the voltage level of V 1 is applied during the second selection period, and during the other T f 1 (1),
  • a selection signal is applied in the third selection period 76, and a non-selection signal is applied in the other periods.
  • the selection signal and the non-selection signal are similarly applied in a time division manner, and the selection signal is sequentially applied to each signal electrode.
  • An adjustment signal is applied to the data electrode as a data signal in order to display 512 colors.
  • the drive voltage 81 is the same as that for the selection signal, V1, V2, V3,
  • pulse width modulation for performing gray scale display by changing the ratio of the width of the first half gray scale signal to the width of the second half gray scale signal applied during each selection period is employed. .
  • a voltage of VI is applied to the data electrode as a gradation signal for the first half gradation signal and a voltage of V4 for the second half gradation signal.
  • the first half has a large potential difference of V6-V1
  • the second half has a small potential of V6-V4. Since the potential difference is generated, by varying the ratio between the first half of the large potential difference and the second half of the small potential difference, the amount of charge applied to the liquid crystal layer is varied to perform gradation display. is there. In other words, the larger the width of the first halftone signal (the longer the period), the brighter the display of the selected pixel.
  • the first data electrode first has a first half-tone signal 8 7 at the voltage level of V 1 and a first half-tone signal 8 at the voltage level of V 4 during the first selection period 74.
  • Apply 8 The period of the first former gradation signal 87 is shorter than the period of the first latter gradation signal 88.
  • a second first half-tone signal 89 is applied in the second selection period 75.
  • the period of the second half-tone signal 89 is shorter than that of the first half-tone signal 87.
  • the period of the first half gradation signal of the third selection period 76 is shorter than the period of the first half gradation signal 87 and longer than the period of the second first half gradation signal 79.
  • the display becomes reddish purple.
  • T f 1 (-) the third half-tone signal 90 of the voltage level of V 6 is applied in the first selection period.
  • the voltage level of the second half gradation signal is V3.
  • the first data electrode applies the fourth first half tone signal 95 of the voltage level of V 1 and the fourth half tone signal of the voltage level of V 4 during the first selection period 74.
  • No. 96 is applied.
  • the period of the fourth former half-tone signal 95 is longer than the period of the fourth latter half-tone signal 96.
  • a first half tone signal shorter than the fourth half tone signal 95 is applied, and in the third selection period 76, the first half tone signal longer than the fourth half tone signal 95 is applied.
  • Apply a gradation signal for this reason, the combination of each color filter R G B causes a strong blue-violet display of blue.
  • T f 1 (1) during the first selection period, the fifth half-tone signal 97 of the voltage level of V 6 and the fifth half-tone signal 98 of the voltage level of V 1 are applied.
  • the driving waveforms described above are signal waveforms generally used for pulse width modulation of a liquid crystal display device that performs 512-color display.
  • the data signal is a grayscale signal
  • grayscale information may be added to the selection signal to generate a grayscale signal. Good.
  • the features are that the three signal electrodes of the RGB color filters are selected at the same time by applying a selection signal at the same time, and the drive voltage is further reduced. Since the RGB filters are arranged in stripes parallel to the signal electrodes, it is very easy to combine the signal electrodes corresponding to the three color filters.
  • the driving waveform described here is a reduced color display pattern signal for performing reduced color display for simultaneously selecting a plurality of signal electrodes.
  • the drive voltage for the low power consumption display is a low power consumption drive voltage 99 composed of six levels of Va, Vb, Vc, Vd, Ve, and Vf. As will be described later, as the selection period of the signal electrode becomes longer, the electro-optical change of the liquid crystal layer can be sufficiently caused even by a weak voltage. The voltage is lower than the voltage 81.
  • the first signal electrode has a low power consumption of the voltage level of Va during a period corresponding to the first selection period 74, the second selection period 75, and the third selection period 76 of Tf1 (+).
  • Apply the first selection signal 100 During the other T f 1 (+) period, the low power first non-selection signal 101 of the voltage level of V e is applied.
  • the same signal as that of the first signal electrode is applied to the second signal electrode and the third signal electrode.
  • a low power consumption selection signal having a voltage level of Va is applied to the other signal electrodes in a selection period in a time-division manner for every three electrodes. Since the signal electrodes are grouped in groups of three, each selection period is three times longer than in the case of color display, and the drive frequency of the selection signal is 13 in the case of color display.
  • the low power consumption second selection signal 102 of the voltage level of V f is applied during the three selection periods, and the low power consumption of the V b voltage level is applied during the other periods.
  • R, G, and B color filters are formed on the three adjacent signal electrodes 2, so that when the three adjacent signal electrodes are collectively selected, R, G, and B color filters are selected collectively.
  • the driving voltage of the data signal applied to the data electrode is the same as the selection signal, and the driving voltage for low power dissipation consists of six levels of Va, Vb, Vc, Vd, Ve, and Vf. 9 9
  • the first data electrode has the same Vf voltage during the first selection period 74, the second selection period 75, and the third selection period 76 of Tf1 (+). Apply the low power consumption first data signal 106 of the level. In other periods, a low power consumption data signal with a voltage level of Vf (bright) or Vc ( ⁇ ) is applied according to the display contents of the other three signal electrodes.
  • the low power consumption second data signal 107 of the voltage level of Va or the low power consumption data signal of the voltage level of Vd is applied.
  • a low power consumption data signal with a voltage level of Va (bright) or Vd (dark) is applied according to the display contents of the other three signal electrodes.
  • the first data electrode has a low power dissipation voltage of Vf during the first, second, and third selection periods 74, 75, and 76 of Tf1 (+). 1 Apply the first half tone signal 1 08 and the low power dissipation first 2nd half tone signal 1 09 of the voltage level of Vc. During the other periods, the low-power half-tone signal of V f voltage level and the low-power half-tone signal of V c voltage level are applied according to the display contents of the other three signal electrodes. I do. During the period of T f 1 (one), the first half-tone signal of the low power dissipation at the voltage level of Va and the low level of the voltage level of Vd A power-supply second-half tone signal is applied.
  • the first half becomes a large potential difference of Va ⁇ V f
  • the second half has a small potential difference of V a-V c, and the ratio between the first half with a large potential difference and the second half with a small potential difference is made variable, whereby gradation display is performed with the amount of charge applied to the liquid crystal layer being variable. That is, the longer the period during which the first half gradation signal is applied, the brighter the pixel is.
  • the selection period of the signal electrode is three times longer in the low power consumption display than in the state in which the 512-color display is performed.
  • the voltage application period of the data signal is three times longer. Therefore, the drive voltage can be reduced.
  • the division of the data signal applied in each selection period into the first half gradation signal and the second half gradation signal is stopped, and the binary display using all the periods is performed.
  • the switching frequency of the voltage of the signal electrode is 1 to 3.
  • the switching frequency of the data signal voltage is 1/3. Therefore, power consumption can be reduced to 1/3 or less.
  • the driving voltage can be reduced.
  • the drive voltage could be reduced from 5.4V to 4.25V, and the ONZOF F ratio applied to the liquid crystal layer 43 could be improved from 1.2 to 1.3.
  • the power consumption of the liquid crystal display can be reduced to 14 or less.
  • the bias ratio which is the step size of the drive voltage
  • the drive voltage can be reduced to 3.85 V
  • the power consumption is 1Z4.2 or less.
  • the power consumption of the LCD controller and driver IC that generates each signal waveform can be reduced to 1/3 the frequency of the power consumption.
  • Power consumption can be reduced to 1 Z 10 or less.
  • the entire display area can be displayed, low power consumption driving can be performed for each block of the signal electrode, and a stripe-shaped color filter that follows the signal electrode is adopted, resulting in good display without rattling of the display. Quality can be achieved.
  • the selection period of the low power selection signal is three times longer than the selection period of the color display pattern signal, so it can be used for data signal gradation
  • the period is three times longer. Therefore, the applied voltage can be reduced, and the power consumption can be reduced.
  • the same low power selection signal is applied to every three signal electrodes.
  • the same low power selection signal is applied to multiples of three, for example, six or nine signal electrodes.
  • a power selection signal may be applied.
  • the drive voltage and power consumption can be further reduced.
  • the display using the color display pattern signal and the display having the same aspect ratio can be realized.
  • FIG. 7 is a driving waveform diagram used for the liquid crystal display device in this embodiment.
  • the liquid crystal display device used in the second embodiment is the same as that described in the first embodiment except that the arrangement directions of the first polarizing plate 21 and the second polarizing plate 22 are different. Since it is the same, description other than that point is omitted.
  • the transmission axes of the first polarizing plate 21 and the second polarizing plate 22 are arranged so as to be parallel to each other, and the liquid crystal layer 1 is formed by combination with the liquid crystal display panel.
  • the applied voltage to 5 is small, a strong reflection characteristic is exhibited, and when the applied voltage is large, a transmission characteristic is exhibited.
  • the horizontal axis of the paper is the time axis 71, in order to prevent application of a DC component to the liquid crystal layer 43.
  • a positive polarity and a negative polarity AC waveform are applied to each screen (field).
  • T f 1 The time of the plus field is T f 1 (+), and the time of the minus field is T fl (-).
  • T f 1 is from 16 milliseconds (msec.) To several milliseconds (msec.).
  • the color display signal is a full-color display pattern signal and a normal color display pattern signal, as in the case of the first embodiment.
  • the drive voltage 81 applied to the liquid crystal layer 43 is composed of six level signals V1, V2, V3, V4, V5, and V6.
  • T fl (+) the selection signal is applied to the first signal electrode during the first selection period 74, the selection signal is applied to the second signal electrode during the second selection period 75, and the selection signal is applied during the third selection period 76.
  • the selection signal is applied to the signal electrode of No. 3.
  • the other T f 1 (+) periods are periods during which the selection signal is applied to the other signal electrodes.
  • a first selection signal 82 having a voltage level of V6 is applied to select the first signal electrode 74, and the first selection period 74 is applied to the other Tf 1 (+) periods.
  • a first non-selection signal 83 having a voltage level of V2 is applied between them.
  • the first signal electrode is applied with the second selection signal 84 having a voltage level of V 1 during the first selection period to select the first signal electrode, and the other T fl is applied.
  • the second non-selection signal 85 of the voltage level of V5 is applied.
  • the selection period is shifted, a selection signal having a voltage level of V 6 is applied to the second selection period 75 of T fl (+), and V 2 is applied to the other T f 1 (+) period. Apply the non-selection signal of the voltage level of.
  • T fl one
  • the second selection period A selection signal of the voltage level of V 1 is applied during the period, and a non-selection signal of the voltage level of V 5 is applied during the other T f 1 (one).
  • a selection signal is applied in the third selection period, and a non-selection signal is applied in other periods.
  • the selection signal and the non-selection signal are similarly applied in a time division manner, and the selection signal is sequentially applied to each signal electrode.
  • a gradation signal is applied to the data electrode as a data signal for performing color display.
  • the driving voltage of the data electrode is composed of eight levels obtained by adding VX1 and VX2 as intermediate voltages to V1 to V6.
  • pulse height modulation that performs gradation display by changing the magnitude of the voltage of the gradation signal applied during the selection period is employed.
  • the voltage difference from the selection signal decreases, and a bright display is performed.
  • the sixth gradation signal 110 of the voltage level of V 1 is applied to the first data electrode during the first selection period 74.
  • the seventh gradation signal 111 of the V4 voltage level is applied, and in the third selection period 76, the gradation signal of the V1 voltage level is applied in the same manner as the first selection period 74. Is applied, and in other selection periods, an independent gradation signal is applied according to each display content.
  • green display is achieved by arranging an R filter on the first signal electrode, a G filter on the second signal electrode, and a B filter on the third signal electrode.
  • the eighth gradation signal 1 12 at the voltage level of V 6 during the first selection period and the ninth gradation signal 1 1 3 at the voltage level of V 3 during the second selection period Is applied.
  • the first data electrode has the first Vx1 voltage level between V1 and V2, which is 10 V, during the first selection period 74 during the period Tf1 (+).
  • the first 1st gradation signal 1 16 at the voltage level of V4 is applied.
  • the third selection period 7 6 is the same as the first selection period 7 4 V x
  • a gray-scale signal of a voltage level of 1 is applied, and an independent gray-scale signal is applied according to each display content in other selection periods.
  • the driving waveforms described above are signal waveforms generally used for pulse height modulation of a liquid crystal display device that performs 512-color display.
  • the features are that the selection period of the signal electrode is lengthened, the drive voltage is reduced, and the data signal is binarized.
  • the drive waveform described here is also a reduced color display pattern signal for simultaneously selecting a plurality of signal electrodes.
  • the drive voltage for the low power consumption display is a low power consumption drive voltage 99 composed of six levels of Va, Vb, Vc, Vd, Ve, and Vf. As will be described later, as the selection period of the signal electrode becomes longer, the electro-optical change of the liquid crystal layer can be sufficiently caused even by a weak voltage.
  • the drive voltage is lower than 81.
  • the first signal electrode has a low power consumption of the voltage level of Va during a period corresponding to the first selection period 74, the second selection period 75, and the third selection period 76 of Tf1 (+).
  • the low power consumption third non-selection signal 122 of the voltage level of V e is applied.
  • the same signal as that of the first signal electrode is applied to the second signal electrode and the third signal electrode.
  • a low power dissipation selection signal having a voltage level of V a is applied to the other signal electrodes in the selection period in a time-divisional manner for every three electrodes. Since the signal electrodes are grouped every three, The selection period is three times that of full color display, and the drive frequency of the selection signal is 1Z3.
  • the low power consumption fourth selection signal 1 2 2 of the voltage level of V f is applied during the three selection periods, and the low power consumption of the V b voltage level is applied during the other periods.
  • 4 Non-selection Signal 1 2 3 is applied.
  • a low power consumption selection signal with a voltage level of V f is applied to each of the three signal electrodes in a time-divisional three-fold selection period.
  • the drive voltage of the data signal applied to the data electrode is the low-voltage drive voltage consisting of six levels of V a, V b, V c, V d, V e, and V f. 9 9
  • the first data electrode has a low power dissipation third data signal of the same Vf voltage level during the first selection period 74, the second selection period 75, and the third selection period 76. Is applied. In other periods, a low power consumption data signal with a voltage level of V ⁇ ( ⁇ ) or Vc (bright) is applied according to the display contents of the other three signal electrodes.
  • a black-and-white binary display is performed in which the triplets of RGB are simultaneously ONZOFF.
  • the low power consumption fourth data signal 125 of the voltage level of Va or the low power consumption data signal of the voltage level of V d is applied.
  • a low power consumption data signal with a voltage level of Va ( ⁇ ) or Vd (bright) is applied according to the display contents of the other three signal electrodes.
  • the selection period of the signal electrode is three times longer in the low power consumption display than in the state in which the 512-color display is performed.
  • the data signal voltage application period is three times longer. Therefore, the driving voltage can be reduced.
  • the switching frequency of the voltage of the signal electrode is 1 to 3.
  • the switching frequency of the data signal voltage is 1 Z 3. Therefore, power consumption can be reduced to 1Z3 or less.
  • the driving voltage can be reduced.
  • the drive voltage was reduced from 5.4 V to 4.25 V, and the ON / OFF ratio applied to the liquid crystal layer 43 was improved from 1.2 to 1.3.
  • the power consumption of the liquid crystal display device can be reduced to 1 to 4 or less.
  • the bias ratio which is the step size of the drive voltage
  • the drive voltage can be reduced to 3.85V, and the power consumption will be 14.2 or less.
  • the power consumption of the LCD controller and driver IC that generates each signal waveform can be reduced to 1/3 the frequency
  • the power consumption of the LCD and LCD controller and driver IC can be reduced to 1/10 or less. It is possible to do.
  • the battery is prevented from being consumed and the liquid crystal display device is environmentally friendly.
  • the entire display area can be displayed, low power consumption driving can be performed for each block of the signal electrode, and a stripe-shaped color filter that follows the signal electrode is adopted, resulting in good display without rattling of the display. Quality can be achieved.
  • the display is bright and the contrast ratio is good, so that the environment in which the liquid crystal display device is used can be recognized at least slightly. Therefore, the lighting of the light source can be restricted, and the illuminance of the light source can be reduced. In the case of the low power consumption mode, means for lowering the illuminance of the light source may be used together.
  • FIG. 8 is a driving waveform diagram used for the liquid crystal display device in this embodiment.
  • the liquid crystal display device used in the third embodiment is the same as that described in the first embodiment, and a description thereof will not be repeated.
  • the horizontal axis of the paper is the time axis 71, in order to prevent application of a DC component to the liquid crystal layer 43.
  • a positive polarity and a negative polarity AC waveform are applied to each screen (field).
  • the time of the plus field is T f 1 (+)
  • the time of the minus field is T f l (one).
  • T f 1 is from 16 milliseconds (msec) to several milliseconds (msec).
  • T fl is short, the current consumed by the liquid crystal display device increases due to an increase in the frequency for driving the liquid crystal and an increase in the voltage applied to the liquid crystal.
  • This color display signal is a full-color display pattern signal and a normal color single display pattern signal as in the case of the first embodiment.
  • the drive voltage 81 applied to the liquid crystal layer 43 is composed of six-level signals of VI, V2, V3, V4, V5, and V6.
  • T fl (+) the selection signal is applied to the first signal electrode during the first selection period 74, the selection signal is applied to the second signal electrode during the second selection period 75, and the selection signal is applied during the third selection period 76.
  • the selection signal is applied to the signal electrode of No. 3.
  • the other T f 1 (+) periods are periods during which the selection signal is applied to the other signal electrodes.
  • a first selection signal 82 of a voltage level of V 6 is applied to select this electrode, and the other T f 1 During the period of (+), the first non-selection signal 83 of the voltage level of V2 is applied.
  • the second selection signal 84 of the voltage level of V 1 is applied during the first selection period.
  • the lever electrode is selected, and a second non-selection signal 85 having a voltage level of V5 is applied during another Tf1 (one) period.
  • a third selection signal 13 1 having a voltage level of V 6 is applied during the second selection period 75 of T f 1 (+), and this electrode is selected.
  • the third non-selection signal 130 of the voltage level of V 2 is applied.
  • the fourth selection signal 13 3 of V 1 voltage level for selecting this electrode and the fourth non-selection signal 13 2 of V 5 voltage level are applied. .
  • a fifth selection signal 13 36 of a voltage level of V 6 is applied to select this electrode, and During the period of T f 1 (+), the fifth non-selection signal 135 of the voltage level of V 2 is applied. Also during the period of T f 1 (-), the selection signal of the voltage level of V 1 for selecting this electrode and the sixth non-selection signal 1 37 of the voltage level of V 5 are applied.
  • a selection signal and a non-selection signal to be time-divided are applied to the other signal electrodes, and the selection signals for the signal electrodes are sequentially applied.
  • the selection period of the signal electrode is sequentially delayed in a time division manner, and the periods other than the selection period are non-selection periods.
  • a gradation signal is applied to the data electrode as a data signal in order to display 512 colors.
  • the drive voltage 81 has six levels of V1, V2, V3, V4, V5, and V6 as in the case of the selection signal.
  • gradation display is performed by changing the ratio between the width of the first half gradation signal and the width of the second half gradation signal applied in the first selection period 74. It employs pulse width modulation that performs the following.
  • the 14th first half gradation signal 1400 of the voltage level of V1 and the 14th second half gradation signal 1441 of the voltage level of V4 are applied. Apply.
  • the period of the 14th first half gradation signal 140 is shorter than the period of the 14th second half gradation signal 144. Shorter than.
  • the 15th first half gradation signal of the voltage level of V1 14 2 and the second half gradation signal of the voltage level of V4 are applied, and the other half of the same selection period is also applied. A pair of a gradation signal and a latter half gradation signal is applied.
  • the 16th first half gradation signal 144 at the V6 voltage level and the 16th second half gradation signal 144 at the V3 voltage level are applied. are doing.
  • the R, G, and B color filters on the first, second, and third signal electrodes, respectively, all pixels display dark dark gray.
  • the driving waveforms described above are signal waveforms generally used for pulse width modulation of a liquid crystal display device that performs 512-color display.
  • the data signal is a display with only two gradations of ON and OFF
  • the selection signal is a display consisting of pairs of every three signals, selecting two and deselecting the other one. is there.
  • a striped color filter arranged in parallel with the signal electrodes. What is described here is a limited color display pattern signal for performing limited color display in which a part of signal electrodes forming a pair is not selected or stopped.
  • the drive voltage for the low power consumption display has six levels of Va, Vb, Vc, Vd, Ve, and Vf. As will be described later, as the selection period of the signal electrode becomes longer, even a weak voltage can cause a sufficient electro-optical change of the liquid crystal layer.
  • the drive voltage is lower than 81.
  • the selection signal since the selection signal is not applied to the third signal electrode, the first signal is output during the first, second, and third selection periods 74, 75, and 76.
  • the selection signal may be applied to two signal electrodes, the electrode and the second signal electrode.
  • the first signal electrode has the first selection period 74 of T f 1 (+) and the second selection period.
  • the low power consumption seventh selection signal 2 51 of the voltage level of Va is applied.
  • the low power dissipation seventh non-selection signal 25 2 having the voltage level of V e is applied.
  • the second signal electrode is applied with a low power dissipation ninth selection signal 25 6 having a voltage level of Va during the second half of the second selection period 75 of T f 1 (+) and the third selection period c
  • the low power ninth non-selection signal 255 of the voltage level of V e is applied.
  • a selection signal is not applied to the third signal electrode, and a low power consumption non-selection signal having a voltage level of Ve is applied.
  • the same low-power selection signal as the first and second signal electrodes is applied to the fourth and fifth signal electrodes, and the selection signal is applied to the sixth signal electrode.
  • the application of the low power consumption selection signal is performed in a time sharing manner.
  • a low power extinction eighth selection signal 25 3 having a voltage level of V f is applied to the first signal electrode in the first half of the first selection period and the second half of the second selection period.
  • the low power dissipation eighth non-selection signal 254 of the voltage level of Vb is applied.
  • a low power consumption 10th selection signal 258 having a voltage level of Vf is applied in the second half of the electrode second selection period and the third selection period.
  • the low power consumption first non-selection signal 257 of the voltage level of V b is applied.
  • a selection signal is not applied to the third signal electrode, and a low power consumption non-selection signal having a voltage level of Vb is applied.
  • the drive voltage of the low power consumption data signal also consists of six levels: Va, Vb, Vc, Vd, Ve, and Vf.
  • the first data electrode The second half of the low power consumption second half tone signal consisting of the voltage level of 260 and Vc Apply the tuning signal 26 1.
  • the second half of the second selection period 75 which is the period when the second signal electrode was selected, and in the third selection period 76, the low power consumption third low-grayscale signal 26 2 of the voltage level of V f
  • a low power extinction third half-tone signal 263 with a voltage level of Vc is applied.
  • a low power gradation signal of a voltage level of Vf or Vc is applied according to the display contents of the other signal electrodes.
  • the low power fourth-half tone signal of the voltage level of Va and the fourth half tone of the low power dissipation of the voltage level of V d according to the display content of the signal electrode Apply signal 2 65.
  • the red and green pixels are displayed dark and the display becomes dark yellow.
  • the time ratio between the low-power first-half tone signal and the low-power second-half tone signal it is possible to display a color that can be expressed in a mixture of red and green.
  • the contrast can be maintained even if there is a signal electrode to which no selection signal is applied.
  • the selection period of the signal electrode is 1.5 times longer in the low power consumption display than in the state in which the 512-color two-color display is performed.
  • the data signal voltage application period is also 1.5 times longer. Therefore, the driving voltage can be reduced. Therefore, the switching of the voltage of the signal electrode becomes 2 3 because the selection period is 1.5 times longer. Similarly, the switching of the voltage of the data signal becomes 2 3.
  • the power consumption can be reduced to 2 to 3 or less. Further, the driving voltage can be reduced.
  • the color can be varied by selecting the signal electrode to which the selection signal is not applied according to the usage environment, and it is possible to ensure both visibility and low power consumption.
  • two of the three signal electrodes are selected, but one signal electrode may be selected.
  • FIG. 9 is a driving waveform diagram used for the liquid crystal display device in this embodiment.
  • the liquid crystal display device used in the fourth embodiment is the same as that described in the first embodiment, and a description thereof will not be repeated.
  • the upper four signals indicating the color display signal in the waveform diagram of FIG. 9 are the same as those described with reference to FIG. 8 in the third embodiment, and thus description thereof will be omitted.
  • This embodiment describes a low-power-consumption drive that combines the characteristics of a limited color display signal for applying a selection signal to only some of the signal electrodes and a color-reduced color display signal for simultaneously selecting a plurality of signal electrodes. Signal.
  • the driving voltage for the low power consumption display has six levels of VI, V2, V3, V4, V5, and V6 as in the case of the color display signal.
  • the first signal electrode is provided with a low power dissipation first selection signal 15 at a voltage level of V 6 during a period corresponding to the first selection period 74 and the second selection period 75 of T f 1 (+). Apply 1.
  • the low power consumption first non-selection signal 15 2 at the voltage level of V 2 is applied.
  • the same signal as that of the first signal electrode is applied to the second signal electrode.
  • No selection signal is applied to the third signal electrode.
  • a low power dissipation selection signal is applied to the fourth and fifth signal electrodes during the same period, and no selection signal is applied to the sixth signal electrode.
  • a low power selection signal is applied to the two signal electrodes, and no selection signal is applied to the other signal electrode.
  • the application of the low power selection signal is performed in a time-division manner for each pair of two signal electrodes.
  • a low power dissipation second selection signal 15 3 having a voltage level of V 1 is applied to the first signal electrode during a period corresponding to the first selection period and the second selection period.
  • the low power consumption 1st 2 non-selection signal 154 of the voltage level of V5 is applied.
  • the same signal as that of the first signal electrode is applied to the second signal electrode.
  • No selection signal is applied to the third signal electrode.
  • the selection signal of T fl (1) is applied to the other signal electrodes in a time-sharing manner.
  • the drive voltage of the low power consumption data signal also consists of six levels, VI, V2, V3, V4, V5, and V6.
  • a low power extinction eighth data signal 155 having the same voltage level of V 1 is applied to the first data electrode during the first selection period 74 and the second selection period 75.
  • a low power ninth data signal 156 at a voltage level of V4 is applied.
  • a low power consumption data signal of V1 (bright) or V4 ( ⁇ ) voltage level is applied according to the display contents of the other three signal electrodes.
  • the low power consumption first data signal 15 7 of the voltage level of V 6 or the first data signal 15 8 of the low power consumption of the voltage level of V 3 is displayed according to the display contents. Apply.
  • a display is performed in which yellow pixels that are a mixture of red and green are subjected to ⁇ N / OFF.
  • the selection period of the signal electrode is twice as long in the low power consumption display as compared to the state in which the 512-color display is performed.
  • the data signal voltage application period is twice as long. Therefore, the driving voltage can be reduced.
  • the division into the first half gradation signal and the second half gradation signal is stopped, and the binary display is performed by using all the periods.
  • the switching of the voltage of the signal electrode becomes 1 Z 2 because the selection period is twice as long.
  • the switching of the voltage of the data signal becomes 1 2.
  • power consumption can be reduced to 12 or less. Further, the driving voltage can be reduced.
  • the driving frequency is reduced.
  • the visibility can be improved by simultaneously selecting a plurality of signal electrodes and adding the color information as bright as possible.
  • the display color can be changed by changing the electrode to which the selection signal is applied, it is possible to ensure both visibility and low power consumption by changing the color according to the usage environment. Further, since the number of gradations of the voltage applied to the data signal is reduced, power consumption can be reduced by simplifying the driving circuit.
  • the low power consumption data signal can be divided into a first half gradation signal and a second half gradation signal to perform gradation display.
  • FIG. 10 is a driving waveform diagram used for the liquid crystal display device in this embodiment.
  • the liquid crystal display device used in the fifth embodiment is the same as that described in the first embodiment, and a description thereof will not be repeated.
  • the upper two signals indicating the full-color display signal in the waveform diagram of FIG. 10 are the same as those described with reference to FIG. 6 in the first embodiment, and the description thereof will be omitted.
  • Described in this embodiment is a reduced color display pattern signal for performing a reduced color display in which each of the R, G, and B filters can be individually selected by reducing the gradation.
  • the drive voltage for the low power consumption display has six levels of VI, V2, V3, V4, V5, and V6, as in the case of the full color display signal. Then, as in the case of the full color display signal, a selection signal of the voltage level of V 6 is applied to each signal electrode during the selection period corresponding to each signal electrode of T f 1 (+), and T f 1 ( The non-selection signal of the voltage level of V2 is applied during the other periods of +). T f 1 (one) Apply the V1 voltage level selection signal during the selection period corresponding to each of the signal electrodes, and apply the V5 voltage level non-selection signal during the other periods of Tf1 (-). .
  • the drive voltage of the low power consumption data signal also consists of six levels, VI, V2, V3, V4, V5, and V6.
  • the low power consumption data signal of this embodiment is different from the data signal of full color display, and the data signal of each pixel is not divided into the first half gradation signal and the second half gradation signal, and is a binary data signal of ONZOF F only. .
  • the first data electrode is supplied with the low power consumption first data signal 270 at the voltage level of V 1 during the first selection period 74 and the third selection period 76 of T f 1 (+).
  • the low power extinction first data signal 271, at the voltage level of V4 is applied.
  • a low power consumption data signal of the voltage level of V 1 (bright) or V 4 ( ⁇ ) is applied according to the display contents of the other signal electrodes.
  • the low power consumption first data signal 2 of the voltage level of V6 (bright) is output as the second data signal 272 of the low power consumption of the voltage level of 2 72 or V3 (dark). Apply according to the display contents of the electrodes.
  • the driving circuit since the number of gradations of the voltage applied to the data signal is reduced in the reduced color display in comparison with the state in which the 512-color display is performed, the driving circuit is simplified. Low power consumption can be achieved.
  • the data signal is ONZOFF binary, but for example, if the data signal of 8 gradations is changed to only 4 gradations, there is an effect of reducing power consumption.
  • FIG. 11 is a plan view similar to FIG. 4 of a liquid crystal display device to which this embodiment is applied.
  • FIG. 12 is a cross-sectional view taken along line 12--12 of FIG.
  • the liquid crystal display device used in the sixth embodiment has striped red (R) color filters 33, green (G) color filters 34, Blue (B) A color filter 35 is provided in parallel with the data electrode 5.
  • This liquid crystal display device is different from the liquid crystal display device described in the first embodiment only in this point, and therefore, description of other points is omitted.
  • the feature of this embodiment is that color display can be performed even when display is performed using the color-reduced color display signal shown in FIG.
  • the same low power consumption selection signal consisting of the low power consumption first selection signal 1000, the low power consumption first non-selection signal 101, etc. is applied to the first to third signal electrodes. Even if they are selected at the same time, unlike the case of the first embodiment, three colors of color filters are not collectively selected.
  • the R, G, and B pixels can be independently selected to perform a normal color display.
  • the R, G, and B pixels are respectively It is also possible to perform full-color display that selects with gradation. That is, using the color-reduced color display signal Thus, the same color display as the color display signal can be performed.
  • the applied signal is the same signal as that described in the first embodiment, the low power consumption effect as described in the first embodiment can be obtained. Therefore, in this embodiment, color display with reduced power consumption can be performed.
  • the display content is three times longer in the direction in which the signal electrodes are arranged than in the display using color display signals. For this reason, in the case of figures such as circles, the accuracy is insufficient, but the display of letters and numbers can be sufficiently identified and is effective.
  • the display will be black and white, but the display content will be in the direction in which the signal and data electrodes are arranged. Each of them will be expanded by three times, and the display with the same aspect ratio as the display by the color display signal can be performed.
  • the number of data electrodes to which the low power consumption data signal is applied the number of achievable colors can be varied and low power consumption can be achieved. Therefore, it is very effective to employ a color-reduced display pattern signal in a liquid crystal display device having a liquid crystal display panel in which a color filter is arranged on a data electrode.
  • FIG. 13 a seventh embodiment of the present invention will be described with reference to FIGS. 13 to 16.
  • FIG. 13 a seventh embodiment of the present invention will be described with reference to FIGS. 13 to 16.
  • FIG. 13 is a schematic plan view of a timepiece including a liquid crystal display panel to which the seventh embodiment of the present invention is applied.
  • FIG. 14 is a cross-sectional view of the timepiece taken along the line I4-1-4.
  • FIG. 15 is a plan view showing a liquid crystal display panel used for the timepiece.
  • Fig. 16 is an enlarged view of a part.
  • this watch is an analog watch that displays the time using a minute hand 46, an hour hand 47, and an hour character 60, and an area inside the parting board 163. Is provided as a display area 13, and various information can be displayed on the liquid crystal display panel. In addition, it has adjustment buttons 16 2 for changing the display contents of the liquid crystal display panel, changing the display contents, correcting the time, and turning on the light source.
  • the upper part of the clock display area 13 is the full-color display area for full-color display of 512 colors, while the lower low power consumption display area 53 is the low power consumption mode.
  • the device operates in the monochrome mode to reduce the power consumption of the liquid crystal display device. Then, the low power consumption mode display 55 indicating this state is displayed.
  • the structure of the liquid crystal display panel in this timepiece is as shown in FIG. 14, from the opposite side (back side) of the windshield 58, the first substrate 1 and the first substrate 1 with a predetermined gap between them.
  • a second substrate 4 is provided.
  • the signal electrode, the counter electrode, the color filter, and the like are not shown in FIG. 14 and will be described later.
  • a liquid crystal layer 43 is provided between the first substrate 1 and the second substrate 4, and the liquid crystal layer 43 includes: Sealed with a sealing material 9 and a sealing material (not shown).
  • An alignment film (not shown) made of polyimide resin is provided on the first substrate 1 and the second substrate 4 to align the liquid crystal layer 43 in a predetermined direction.
  • a twisted nematic liquid crystal is used as the liquid crystal layer 43.
  • the liquid crystal layer 43 is oriented in the direction of 7:30 on the first substrate 1 side and in the direction of 4:30 on the second substrate 4 side.
  • the twist angle of the liquid crystal layer 43 is 90 degrees.
  • the material used as the liquid crystal layer 43 is not limited to the twisted nematic liquid crystal, and may be other materials such as a guest-host type liquid crystal, a scattering type liquid crystal, and a selective reflection type liquid crystal.
  • first polarizing plate 21 made of 3D RDF (trade name) as a reflective polarizing plate.
  • second polarizing plate 22 made of an absorption polarizing plate in which a dye is stretched in one direction, and the transmission axes of the first polarizing plate 21 and the second polarizing plate 22 are provided.
  • a light source 66 is arranged on the back side of the liquid crystal display panel as shown in Fig. 14 so that the watch can be used in a dark environment, and a circuit board 6 is provided on the back side of the light source 66.
  • Place 8 The connection between the liquid crystal display panel and the circuit board 68 is made with zebra rubber 61, and the connection between the light source 66 and the circuit board 68 is made with the light source terminal 67.
  • zebra rubber is used, but a spring may be used.
  • the battery 64 is fixed to the circuit board 68. This battery 64 is the energy source for this watch.
  • a drive unit 69 having a pointer shaft 48 connected to the minute hand 46 and the hour hand 47 is arranged between the light source 66 and the circuit board 68.
  • the pointer shaft 48 extends from the drive part 69 through the pointer shaft hole 49 including the opening 54 of the liquid crystal display panel, and the windshield 5 It protrudes to the 8 side.
  • a printing layer 50 having a shielding effect is provided on the windshield 58 side of the first polarizing plate 21 and at the same time, a time character 60 is formed.
  • the module frame 70 has a parting plate 163.
  • a signal electrode 2 made of a transparent conductive film is provided on a first substrate 1 made of a transparent substrate.
  • the signal electrodes 2 are striped row electrodes that are substantially parallel from the first signal electrode 2-1 to the n-th signal electrode 2-n except for the detour 80 around the opening 54. It is a pattern.
  • the signal electrode forms a signal electrode detour portion 80 narrower than the stripe-shaped signal electrode 2, and the opening is formed. Is bypassing.
  • a data electrode 5 made of a transparent conductive film is provided on the second substrate 4 facing the first substrate 1 with a predetermined gap. Data electrode 5 is
  • the data electrodes 5 for one row are formed in two from the top and bottom, respectively, ending at the center. Due to the outer shape of the liquid crystal display panel, the data electrode 5 near the opening 5 4 is shorter than the other data electrodes 5,
  • the signal electrode 2 provided on the first substrate 1 is formed by using a sealing material 9 for sealing the liquid crystal layer 43 provided around the display area as an anisotropic conductive sealing material.
  • the connection electrodes 44 are formed alternately on the left and right every other line.
  • Anisotropic conductive sealing material consists of insulating resin with conductive particles (Fig. (Not shown) can be connected to the connection electrode 44 from the signal electrode 2 via conductive particles.
  • the same number of connection electrodes 44 are drawn out in front of and behind the drawing of the display area 13 to enable connection to the circuit board. This is an effective configuration when the number of pixel units is small, since the display area can be made larger than the outer shape of the substrate.
  • a red (R) color filter 33, a green (G) color filter 34, and a blue (B) color filter 35 are provided on the second substrate 4.
  • Each color filter has a stripe shape.
  • the color filters 33, 34, and 35 have a stripe shape parallel to the signal electrodes 2. Therefore, a clear display can be achieved when a reduced color display pattern signal, a limited color display pattern signal, or a reduced color display pattern signal is used.
  • the color filter 3 may be composed of three colors of cyan (C), magenta (M), and yellow (Y), or may be a dot-shaped color filter.
  • the data electrode 5 is provided on the color filters 33, 34, 35 via an interlayer insulating film (not shown) made of acrylic resin. Then, as shown in FIG. 16, a portion where the signal electrode 2 and the data electrode 5 overlap is the pixel portion 7, and a region where the plurality of pixel portions 7 are arranged in a matrix is the display region 13.
  • the display control of a timepiece having such a liquid crystal display panel is driven by the drive signals described in the first to fifth embodiments, and a full color display, a reduced color display, a limited color display,
  • the power consumption can be reduced by switching the low-power display of low-power display to low power consumption, and a dot matrix type color display can be performed on the watch.
  • FIG. 17 An eighth embodiment of the present invention will be described with reference to FIGS. 17 to 21.
  • FIG. 17 An eighth embodiment of the present invention will be described with reference to FIGS. 17 to 21.
  • FIG. 17 shows a liquid crystal display panel to which the eighth embodiment of the present invention is applied. It is a plane schematic diagram of a timepiece.
  • FIG. 18 is a plan view showing a liquid crystal display panel used for the timepiece.
  • FIG. 19 is a cross-sectional view of the timepiece taken along the line 191-119.
  • FIG. 20 is a block diagram showing a circuit for reducing the power consumption of the timepiece.
  • FIG. 21 is a diagram showing an example of low power consumption control performed by vertically dividing the dot matrix display section of the timepiece.
  • this clock is a clock that digitally displays time on a time display section 173, and furthermore, a character display section 170, a schedule display section 171, a menu display section It is a clock that has 17 2 and can display various information in addition to the time. It also has an adjustment button 162 for changing the display content and a switch 222 for switching the display mode.
  • the liquid crystal display panel 20 provided in this timepiece is provided with the first substrate 1 and signal electrodes from the opposite side (back side) of the windshield 58. Two types of signal electrodes are provided, a striped signal electrode and a segmented signal electrode. A red (R) color filter, a green (G) color filter, and a blue (B) color filter are provided on a second substrate 4 which faces the first substrate 1 with a predetermined gap.
  • the color filters have a stripe shape parallel to the data electrodes. That is, the color filter is provided in a region overlapping with a stripe-shaped data electrode described later, and is not provided in a segment-shaped data electrode portion.
  • a clear display can be achieved when a reduced color display pattern signal, a limited color display pattern signal, or a reduced color display pattern signal is used.
  • C magenta
  • Y yellow
  • An interlayer insulating film made of ataryl resin is provided on the color filter. Between layers A striped data electrode and a segmented data electrode are provided on the insulating film. A portion where the signal electrode and the data electrode overlap is a pixel portion. The area where a plurality of strip-shaped signal electrodes and data electrodes overlap is the dot matrix display area 18 1 shown in FIG. 18, and the area where the segment-shaped signal electrodes and data electrodes overlap is the segment display area. 1 8 2
  • a dot display section 18 1 shown in FIG. 18 constitutes a character display section 170 and a schedule display section 17 1.
  • the character display section 170 and the schedule display section 171 are not necessarily in such a positional relationship, and are set as needed at an arbitrary position in the dot matrix display section 181.
  • the segment display section 18 2 constitutes a menu display section 17 2 and a time display section 17 3.
  • the power consumption is reduced by making the time and menus segment-type and the display area with a lot of information as matrix-type.
  • the time display section 173 is not provided with a color filter and is displayed in monochrome, with emphasis on brightness and low power consumption.
  • the dot matrix display section 18 1 uses a full color display with gradation signals, a reduced color display, a reduced color display, and a limited color display to display from high quality display to low power consumption mode.
  • a liquid crystal layer 43 is provided between the first substrate 1 and the second substrate 4, and the liquid crystal layer 43 is sealed with a sealing material 9 and a sealing material 10.
  • an alignment film (not shown) made of polyimide resin is provided on the surface of the first substrate 1 and the second substrate 4 on the liquid crystal layer 43 side in order to align the liquid crystal layer 43 in a predetermined direction. Is provided.
  • the twist angle of the liquid crystal layer 43 is any one of 210 degrees to 260 degrees.
  • other liquid crystal such as a guest-host type liquid crystal, a scattering type liquid crystal, and a selective reflection type liquid crystal may be used for the liquid crystal layer 43.
  • the first polarizing plate 21 and the second polarizing plate 22 were arranged so that their transmission axes were parallel to each other, and were applied to the liquid crystal layer 4 3 in combination with the liquid crystal display panel 20.
  • the liquid crystal display panel 20 can be configured.
  • a light source 66 is arranged on the back side of the liquid crystal display panel 20 so that the clock can be used in a dark environment, and a circuit board 68 is arranged on the back side of the light source.
  • a battery 64 is fixed to the circuit board 68.
  • an LCD controller & driver IC (integrated circuit) 178 for applying predetermined signals to the signal electrode and the data electrode is provided. Mounting is performed by the chip-on-glass mounting method (face-down bonding method).
  • the signal electrodes and data electrodes of the dot matrix display section 18 1 and the segment display section 18 2 are connected to the LCD controller & driver IC by connecting electrodes including the signal electrode connecting electrode. It is connected to the 178, and is driven by the applied voltage (signal) supplied from the LCD controller & driver IC 178.
  • the strip-shaped signal electrodes 17 5 are formed on the second substrate 4 using an anisotropic conductive adhesive that disperses conductive particles in the sealing material 9.
  • the electrical arrangement is changed to the signal electrode connection electrode provided in the above.
  • the segment type signal electrodes are rearranged on the second substrate 4 using an anisotropic conductive adhesive.
  • the input of external signals to the LCD controller & driver IC 178 is performed by the input electrode 180 provided on the second substrate 4, and the connection between the circuit board 68 and the input electrode 180 is zebra rubber 6 Perform by 1.
  • the watch is provided with a parting plate 163 in order to prevent unnecessary parts of the liquid crystal module from being observed by the user of the watch, thereby shielding the unnecessary parts.
  • the watch by providing the watch with a power generation function, it can be used for a long time without replacing the battery 64.
  • the back cover 57 is made of a material that transmits light, and a solar battery 205 is provided inside the back cover 57 as a power generation means via an ultraviolet light cut film 206.
  • the parting plate is a solar cell 204.
  • the solar cells 204 and 205 are connected to the circuit board 68 by connection lines 208 and 207, respectively.
  • the battery 64 is charged by the solar battery 204 as a parting plate, and when the watch is not mounted, the battery is charged by the solar battery 205 provided on the back cover 57.
  • a mechanism for converting kinetic energy into electric energy a mechanism for converting heat energy into electric energy, or the like may be used in addition to the solar cell.
  • the power generation status of the solar cells 204 and 205 as the power generation means 185 is detected by the voltage detection circuit 186.
  • Power generation energy from the solar cell is charged from the voltage detection circuit 186 to the secondary battery 187 via the charging voltage conversion circuit 188.
  • the remaining battery level detecting circuit 189 detects the status of the voltage detecting circuit 186 and the state of the secondary battery 187, and sends it to the display mode switching signal generating circuit 194.
  • the display mode switching signal generator circuit 194 is the information from the battery level detector circuit 189. That is, depending on the remaining battery power and the amount of power generation, a multiple simultaneous selection circuit block 1995 gradation signal generation circuit 1996, full color display pattern signal generation circuit 1997, low color display pattern signal generation circuit 1998 And a signal for selecting the reduced color display pattern signal generation circuit 199, the limited color display pattern signal generation circuit 200, and the display stop circuit 201.
  • Full color display pattern signal generation circuit 197, reduced color display pattern signal generation circuit 198, reduced color display pattern signal generation circuit 199, limited color display pattern signal generation circuit 200 Circuit for generating the full-color display pattern signal, the reduced color display pattern signal, the reduced-color display pattern signal, and the limited color display pattern signal described in the above embodiments. It is also possible to select and generate a display signal having the characteristics of a plurality of display pattern signals.
  • the display stop circuit 201 stops the display of the dot matrix display section 18 1.
  • the gradation signal generation circuit 196 is a circuit for giving a gradation to the signal generated by each of the circuits 197 to 200, and is provided separately from the circuits 197 to 201. Selected. If the gray scale signal generation circuit 196 is not selected, gray scale display will not be performed, but power consumption can be reduced.
  • the display mode switching signal generation circuit 194 selects a circuit that performs display with less power consumption when the battery level is low, and activates the display stop circuit 201 when the battery level drops below a certain limit. Select to stop the display of the dot matrix display section 18 1. However, only the circuit for displaying the dot matrix display section 18 1 is selected by the multiple simultaneous selection circuit block 19 5, and the display of the segment display section 18 2 is always the same regardless of the selection. To do.
  • the dot matrix display section 18 1 is divided into an upper display area 2 12 and a lower display area 2 13 as shown in FIG. Circuits are individually selected for these.
  • One whole may be controlled as one display area.
  • the signal of the reference clock oscillation circuit 190 is synchronized with the synchronization separation circuit 1
  • the selection signal generation circuit 202 and the data signal generation are performed based on the data from the display data generation circuit described later and the output signals of the vertical synchronization circuit 1992 and the horizontal synchronization circuit 1993. Generate data to be sent to circuit 203. Then, the selection signal generated by the selection signal generation circuit 202 based on this data and the data signal generated by the data signal generation circuit 203 are output to the liquid crystal display panel 20.
  • the display data other than the time is generated by a display data generation circuit other than the time, and is input to the multiple simultaneous selection circuit block 195.
  • the time display data is measured by the clock circuit 183 using the output clock of the reference clock oscillation circuit 190, and the time is displayed by the time display data generation circuit 184 based on the measured time. Data is generated and input to the multiple simultaneous selection circuit block 195.
  • the display method of the dot matrix display section 18 1 can be selected by the switch 222.
  • the information that the switch 222 has been pressed is transmitted to the multiple simultaneous selection circuit block 195, and the circuit is selected accordingly.
  • the display method of the dot lita display section 181 can be changed every predetermined time.
  • the timer 220 which measures the time by the output clock of the reference clock oscillator circuit 190, sends a signal to the multiple simultaneous selection circuit block 195 when a predetermined time comes, and the circuit is accordingly operated. Make a selection.
  • FIG. 21 shows the display modes 215 to 218 of the dot matrix display section 181.
  • both the upper display area 2 12 and the lower display area 2 13 perform full-color display of 5 12 colors.
  • this is a display in which the power consumption of the liquid crystal display device is large and the display capability of the liquid crystal display panel 20 of this watch is at its maximum.
  • the lower display area 2 13 performs full-color display in order to reduce power consumption, while the lower display area 2 13 uses reduced color display pattern signals to reduce the number of gradations. Display is performed, and the number of colors is reduced to eight.
  • the same subtractive color display pattern signal is applied to the signal electrodes three by three, and the data electrodes use only one of the three R, G, and B colors. This limits the number of display colors to four.
  • the same three color reduction display pattern signals are applied to both the signal electrode and the data electrode, and furthermore, a black-and-white binary display without gradation display is used for efficient low power consumption. Yes, it is.
  • the display since a color filter parallel to the data electrode is formed, when a reduced color display pattern signal for simultaneously selecting a plurality of signal electrodes is used, the display extends vertically as compared with the case of full color display. It will be.
  • the same three faded color display pattern signals are applied to both the signal electrode and the data electrode.
  • the lower display area 2 13 is applied with a limited display pattern signal using a limited display pattern signal for driving two signal electrodes and stopping one signal electrode. Furthermore, since the characters are enlarged by using the reduced color display pattern signal together, the influence on the visibility due to stopping the driving of the signal electrode is reduced.
  • the remaining power of the secondary battery 187 which is the energy source of the liquid crystal display device, is reduced, and the amount of power generated by the solar battery 204, which is the power generation means 185, is reduced, so that sufficient power for driving From 2 15 to 2 16, 2 17, when switch 22 2 is pressed by the watch user, or when a preset time has elapsed. Reduce power consumption to 2 18.
  • the remaining amount of the secondary battery 187 recovers, the power generation of the solar battery 204 recovers, so that sufficient power can be secured, or the operation of the watch user When there is, return to the display of 2 15 to release the low power consumption.
  • the example shown here is merely an example of the control for reducing the power consumption, and the order and combination of the display pattern signals to be used are not limited thereto.
  • the dot display section 18 1 is always divided into the same upper display section 2 12 and lower display section 2 13 for control, but the boundary line can be moved according to the situation,
  • the control may be divided into three or more areas.
  • liquid crystal display panel 20 provided with a color filter parallel to the data electrode 5 has been described, but the same applies to the case where a color filter parallel to the signal electrode 2 is provided. Controls can be applied.
  • the power consumption can be reduced and the watch can perform dot matrix type color display.
  • the function as a clock can be maintained by the power generation mechanism provided in the clock.
  • switching the low power consumption mode of the liquid crystal display panel according to the remaining battery power it is possible to extend the battery life.
  • charging can be performed without deteriorating the display quality of the liquid crystal display panel.
  • reduced color display pattern signal reduced color display pattern signal, limiting power
  • a signal having two or more characteristics of the error display pattern signal it is possible to further reduce power consumption.
  • the driving method of the liquid crystal display panel of the present invention by performing the subtractive color display using the subtractive color display pattern signal for simultaneously selecting a plurality of signal electrodes, the comparison with the color display pattern signal is performed. As a result, the time for selecting the signal electrode can be extended. That is, the frequency between the selection signal and the data signal can be reduced.
  • the liquid crystal layer changes electro-optically with the effective value voltage applied for a certain period of time, if multiple signal electrodes are selected at the same time to reduce the number of time divisions, the voltage of the selection signal and data signal can be reduced according to the voltage averaging method It becomes possible to reduce. By reducing the frequency and the voltage, the power consumed by the liquid crystal display device can be reduced in both the driving circuit and the liquid crystal layer. In addition, by simultaneously selecting a plurality of selection signals, a plurality of color filters are selected at the same time, so that a bright display is possible.
  • this reduced-color display is applied to a liquid crystal display panel that has a color filter in the form of stripes parallel to the data electrodes, low power consumption can be achieved while maintaining the same number of colors as the display using the color display pattern signal. Can be very effective. Also, by performing limited color display using a limited color display pattern signal that selects only some of the signal electrodes, it is possible to lengthen the time to select a signal electrode compared to the color display pattern signal. Thus, the frequencies of the selection signal and the data signal can be reduced. Further, in this case, the color can be changed by changing the signal electrode to be selected according to the environment and purpose, It enables both visibility and low power consumption.
  • the reduced color display is performed by using the reduced color display pattern signal in which the number of gradations of the data signal is reduced as compared with the case of the full color display, the driving of the data signal driving circuit can be simplified, and the low power consumption Electrification becomes possible.
  • the display on the LCD panel is switched to a display with low power consumption according to the operation of the battery level and the power generation user, thereby minimizing the degradation of display quality and minimizing power consumption. It can be realized, and the life of the battery can be extended when it is driven by the battery. If the display area of the liquid crystal display panel is divided into a plurality of parts and the control is performed individually, the effect is more remarkable.
  • the method of the present invention is applied to the display control of a timepiece, it is possible to display a color on a liquid crystal display panel even in a timepiece in which demand for low power consumption is strict in terms of shape and size.
  • the present invention not only to watches but also to liquid crystal display panels of electronic devices such as mobile electronic devices, personal digital assistants, mobile phones, and portable game machines, the power consumption of these electronic devices can be reduced.
  • An electronic device that is easy to use can be provided.

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  • Liquid Crystal (AREA)

Abstract

L'invention concerne un écran à cristaux liquides couleur. La couche à cristaux liquides est scellée dans l'espace entre un premier substrat sur lequel sont formés des électrodes de signaux et un second substrat sur lequel sont formées des électrodes de données. Des pièces à pixels sont formées dans la zone où les électrodes de signaux et les électrodes de données se croisent. Enfin, des filtres colorés, chacun renfermant des filtres de trois couleurs primaires disposés en alternance, sont placés de façon à correspondre aux pièces à pixels. Ainsi, l'affichage normal en couleur, tel qu'un signal de sélection est envoyé à toutes les électrodes de signaux selon une répartition temporelle et qu'un signal de données est envoyé aux électrodes de données selon le signal de sélection, et l'affichage en couleurs soustractives, tel qu'un signal de sélection est envoyé de façon à choisir certaines des électrodes de signaux, sont sélectivement exécutés. La consommation d'énergie de cet écran est, par conséquent, faible.
PCT/JP2000/006675 1999-09-27 2000-09-27 Procede de commande d'un ecran a cristaux liquides couleur et procede de commande de l'affichage de la montre WO2001024156A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US09/831,904 US6429840B1 (en) 1999-09-27 2000-09-27 Method of driving color liquid crystal display panel and method of controlling display of timepiece
EP00962898A EP1148468A4 (fr) 1999-09-27 2000-09-27 Procede de commande d'un ecran a cristaux liquides couleur et procede de commande de l'affichage de la montre

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11/272613 1999-09-27
JP27261399 1999-09-27

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WO2001024156A1 true WO2001024156A1 (fr) 2001-04-05

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US (1) US6429840B1 (fr)
EP (1) EP1148468A4 (fr)
KR (1) KR100427162B1 (fr)
CN (1) CN1190766C (fr)
WO (1) WO2001024156A1 (fr)

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KR20010093080A (ko) 2001-10-27
CN1322339A (zh) 2001-11-14
EP1148468A1 (fr) 2001-10-24
CN1190766C (zh) 2005-02-23
EP1148468A4 (fr) 2005-02-02
KR100427162B1 (ko) 2004-04-14
US6429840B1 (en) 2002-08-06

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